In this activity, learners practice estimation skills as they begin to explore the Hubble Deep Field image. They first give a rough estimate of the number of objects and then follow several steps, using representative sampling techniques, to improve...(View More) upon their original estimates. Finally, learners calculate the number of similar objects in the universe based on their estimate. This is activity one of four in the Hubble Deep Field Lesson Package which includes color lithographs, student worksheets, background information, a glossary, as well as national science education standards. Request a paper copy of the HDF package through the "contact us" page of Amazing Space - be sure to include your mailing address.(View Less)